Trauma scene flights are often the first thing people think of when they think of Helicopter EMS. Although we know that HEMS and Critical Care Transport involves much more than just scene flights, they are still a critical part of most HEMS programs’ mission and capabilities. In addition, many flights are “modified scenes” or “scene intercepts,” meaning the HEMS crew meets the EMS crew at an outlying hospital helipad, or arrives shortly after the patient’s arrival to an under-resourced ED. Many of these patients are critically ill, and a subset will require intubation and ventilation. Once intubated is bag valve ventilation enough? Or should all these patient’s be placed on a mechanical ventilator?